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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a520b02d65561ce26f6f42103e017ec3fc721d588eb15e761ba1f1b60fe8f780' 
  AND token = 'LhkQ4ujyFZOl7eEgpkMbY6Yxobg8Q1WARcUHBvL58b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}